QOI Won't Open? Convert to MNG Instantly
Fast, instant QOI to MNG conversion. No signup required. Just drop your .qoi file and get .mng in seconds.
Batch Settings
About QOI to MNG Conversion
Dealing with a QOI file that won't open on your device? You're not alone — QOI compatibility issues are one of the most common reasons people search for a file converter. QOI is a widely used file format.
The fix is simple: convert your QOI to MNG. MNG is a widely used file format. This conversion lets you convert between formats quickly, solving the problem in seconds rather than hours of troubleshooting.
Converting QOI to MNG maintains high quality with CocoConvert's optimised encoder settings.
CocoConvert processes your QOI file on secure servers in Germany — upload, convert, download. Your files are encrypted via TLS and automatically deleted within 24 hours. No account needed, no software to install, and it works on any device with a browser.
This conversion is ideal when you When you need a MNG file.
The conversion engine behind CocoConvert uses FFmpeg, Sharp, and qpdf — the same open-source libraries trusted by Netflix, YouTube, and enterprise platforms. Pro users can batch convert up to 100 files at once.
How to Convert QOI to MNG
- 1
Add your QOI file
Drag and drop your .qoi file into the converter, or tap "Browse" to pick it from your device. Multiple files are supported for batch processing.
- 2
Pick MNG output
Select .mng as the target format. CocoConvert automatically applies the best quality settings for this conversion.
- 3
Start conversion
Hit the Convert button. The image engine processes your file server-side — no CPU drain on your device.
- 4
Save your file
Once done, download your .mng file. For batch jobs, download all at once as a zip.
What Happens When You Convert QOI to MNG
Your QOI file is decoded and re-encoded as MNG.
Your QOI file is uploaded and validated
The file is decoded (parsed into its raw data)
The data is re-encoded in MNG format
The converted file is ready for download
Format Comparison
QOI
.qoi file
| Extension | .qoi |
| MIME Type | image/qoi |
| Category | Image |
MNG
.mng file
| Extension | .mng |
| MIME Type | video/x-mng |
| Category | Image |
Should You Convert QOI to MNG?
When to Convert
- ✓When you need a MNG file
Frequently Asked Questions
Why won't my QOI file open?
QOI files may not open if your device lacks the right codec or application. Converting to MNG — a more widely supported format — usually resolves this. MNG is a widely used file format.
Is it safe to convert QOI to MNG online?
Yes. CocoConvert encrypts your file via TLS, processes it on isolated servers in Germany, and permanently deletes it within 24 hours. Your files are never shared or analysed.
Will I lose quality converting QOI to MNG?
Converting QOI to MNG maintains high quality with CocoConvert's optimised encoder settings. CocoConvert uses high-quality encoder defaults to preserve as much fidelity as possible.
How large can my QOI file be?
Free users can convert files up to 250 MB each. Pro users get a 5 GB limit per file, and Business API users have custom limits.
Can I convert QOI to MNG on my phone?
Absolutely. CocoConvert works in any modern browser — iOS Safari, Android Chrome, and all desktop browsers. No app required.
Versions are pinned in our worker Dockerfile and re-built via CI on every change.